Yoshitake EB-12 is a high-performance double-type bellows expansion joint designed to protect pipelines from thermal expansion, contraction, vibration, and external impact. With a maximum axial extension of 70 mm, it handles various non-dangerous fluids including steam, air, cold and hot water, and oil up to 2.0 MPa and 220°C. The wetted parts are constructed from SUS316L stainless steel for exceptional corrosion resistance and durability.

Features

• Internal Protection: A control ring provides reinforcement against internal pressure and equalizes bellows expansion.
• Maintenance-Free: The packless design eliminates the need for retightening or replacement due to aging. Easy to maintain and manage.
• Integrated Design: The flange, short pipe, and bellows are united in a simple structure.
• External Protection: An outer carbon steel pipe protects the bellows from external impact damage.
• Inner Pipe Included: A stainless steel inner pipe prevents fluid pressure loss, vibration, impact, and corrosion.
• High Durability: Stainless steel wetted parts offer high resistance to corrosion and ensures distinguished durability.

Specifications

Model	EB-12
Application	Steam, Air, Cold and hot water, Oil, Other non-dangerous fluids
Maximum pressure	2.0 MPa
Max. temperature	220°C
Max. axial extension	70 mm (Expansion 20 mm, Compression 50 mm)*
Outer pipe material	Carbon steel
Bellows, inner pipe material	Stainless steel (SUS316L)
Connection	JIS 20K RF flanged

INFO

• Expansion of one side from the centering anchor base is 10 mm and compression is 25 mm. Available with nominal sizes from 300A to 450A as EB-8 (Double type).

Dimensions and Weights

Nominal size	L	Max. operating length	Min. operating length	Max. axial extension	Do	d	H	J	K	A	B	C	h1	Bolt size	Weight (kg)
20A	680	700	630	70	58.2	100	100	100	60	135	95	3.2	12	M10	4.8
25A	680	700	630	70	58.2	125	100	100	60	135	95	3.2	12	M10	5.7

Parts and Materials

No.	Part Name	Material
13	Anchor Base	Rolled Steel (SS400)
12	Outside Pipe	Rolled Mild Steel (SPHC)
11	Reinforce Pipe	Rolled Steel (SS400)
10	Middle Ring	Rolled Steel (SS400)
9	Inside Pipe	Stainless Steel (SUS316L)
8	Control Ring	Rolled Steel (SS400)
7	Bellows	Stainless Steel (SUS316L)
6	Ring	Rolled Steel (SS400)
5	Shipping Bolt	Rolled Steel (SS400)
4	Shipping Washer	Rolled Steel (SS400)

WARNING

Be sure to remove the Shipping Washer and Shipping Bolt after installation (Fixing point and guide execution).